首页
登录
职称英语
【B1】 [br] 【B8】 [originaltext]A summary of the physical and chemical nature of li
【B1】 [br] 【B8】 [originaltext]A summary of the physical and chemical nature of li
游客
2024-03-04
63
管理
问题
【B1】 [br] 【B8】
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun. In fact, it is at the Sun’s very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium(氦). And, in doing so, it releases some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of years.
The nuclear energy is released at the Sun’s center as high-energy gamma radiation, a form of electro-magnetic radiation like light and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun, to be re-emitted at slightly longer wavelengths. This radiation, in its turn, is absorbed and re-emitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum(频谱), eventually becoming light. At this stage, it has reached what we call: the solar surface and can escape into space, without being absorbed further by solar atoms. A very small fraction of the Sun’s light and heat is emitted in such directions that after passing through space, it hits the Earth.
选项
答案
Absorbed
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3503366.html
相关试题推荐
[originaltext]Smartphonesdistractattentionandreducelearningbecauseof
[originaltext]Smartphonesdistractattentionandreducelearningbecauseof
[originaltext]Smartphonesdistractattentionandreducelearningbecauseof
[originaltext]Goodafternoon.Intoday’slecture,we’llbetalkingaboutho
[originaltext]Goodafternoon.Intoday’slecture,we’llbetalkingaboutho
[originaltext]Everyoneissupposedtocheerforgoodguys,andweshouldon
[originaltext]Everyoneissupposedtocheerforgoodguys,andweshouldon
[originaltext]Everyoneissupposedtocheerforgoodguys,andweshouldon
[originaltext]Anewstudyhasfoundapositivecorrelationbetweenhowmuch
[originaltext]M:Hi,there!I’vecometoseetheflat.MynameisMarkAdams.W
随机试题
StrategicallysituatedinShanghai’smostprosperousandwellconnectedcentral
Thousandsofteachersattheelementary,secondary,andcollegelevelscant
下列指标中,属于项目动态财务评价指标的有()。A.利息备付率 B.财务内部
为解决某一特定问题而设计的指令序列称为A.语言 B.程序 C.软件 D.系
证券产品选择的目标包括( )。 Ⅰ本金保障 Ⅱ资本增值 Ⅲ降低风险 Ⅳ
功用为攻下通便,补气养血的方剂是()A.温脾汤 B.黄龙汤 C.济川煎
A.天麻B.羚羊角C.钩藤D.地龙E.白蒺藜具有抗肿瘤的药物是
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
只承受节点荷载的某钢桁架,跨度30m,两端各悬挑6m,桁架高度4.5m,钢材采用
“教学的目的在于使学生发现心中已有的真理,而不是去认识客观的物质世界,教学活动就
最新回复
(
0
)